and pete williams saying there has been though arrest made. the fbi coming out and confirming that. we've got video of somebody setting down a bag, but no idea. they also have what they call solid leads, but no arrests. that's what we stand as we hit 3:00 p.m. eastern time. >> we'll continue to follow it on cnbc. thank you very much for watching "street signs." >>> and we do welcome you to this edition of the "closing bell," a back and forth day of epic proportions for the markets and the news. i'm bill griffeth here at cnbc headquarters. >> and i'm michelle crusoe down here at the new york stock exchange, bill. let's go through what we know at this hour, one hour before the close. the news related to the boston bombings, certainly moving the markets back and forth today. here's what we know definitively. video shows is someone setting down a bag near the bomb location. authorities have told nbc news there are solid leads, but no arrest has been made yet. we've heard that now from numerous sources, including the fbi. no one has been specifically identified. we are waiting, however,